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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Cylinder mods - "DE" Bore
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[QUOTE="cujet, post: 569717, member: 19501"] That is probably somthing you would have to cobble up on your own. There have been smaller exhaust flanges available from time to time. But, most of the time, they are just a little smaller than stock and change the power slightly. You could try a washer or other restriction in the headpipe area in an experiment. I think your smaller bore engine would need serious mods to function as you would like. Probably a custom set of powervalves too. There are many ways to get what you are looking for, including machining the bottom of the cylinder to lower the port timing, reducing compression to lower the total output, welding ports up and then machining them to a smaller size vs. stock. A smaller carb also can help with throttle control and will help to reduce output. Ignition timing can be adjusted for less power also. As a matter of fact, outboards used to adjust the timing to control the power output! It was directly connected to the throttle! Good Luck! Chris [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Cylinder mods - "DE" Bore
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